ITB, how much more power? - Page 4 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Dimman · 08-09-2011, 11:42 PM

Quote:

Originally Posted by 1660

The technology at low load or RPM concerns emissions. If performance is the concern then AFR and fuel into the cylinder is more important.

If you're upgrading the cam, the last thing you're concerned about is emission.

Low RPM response has a bit to do with how 'active' the intake charge is in the chamber. If the air is slow, there is not very much turbulence and the air and fuel don't mix and burn as well as they should. This affects torque.

So there is a bit of performance potential with low RPM airflow tuning.

@Madfast: Thanks for that post!

1660 · 08-10-2011, 03:14 AM

Quote:

Originally Posted by Dimman

Low RPM response has a bit to do with how 'active' the intake charge is in the chamber. If the air is slow, there is not very much turbulence and the air and fuel don't mix and burn as well as they should. This affects torque.

So there is a bit of performance potential with low RPM airflow tuning.

@Madfast: Thanks for that post!

You might want to look at the LFA's engine. It has ITBs with dual stage variable intake. There is a good chance Yamaha will use similar technology.

http://en.wikipedia.org/wiki/Lexus_LFA#Engine

"Air is fed directly from beneath the hood through a visible slit passing into a dual stage variable intake manifold and then into ten individual throttle bodies before finally exiting from a dual stage titanium muffler."

"The engine redlines at 9,000 rpm, but with a fuel cutoff set at 9,500 rpm,[49] and is constructed using forged aluminum pistons, forged titanium connecting rods, and solid titanium valves."

1660 · 08-10-2011, 04:19 AM

Came across this on ft86club:

http://www.ft86club.com/forums/showthread.php?t=1259

It will give a lot of insight on Yamaha's approach on design.

Dimman · 08-10-2011, 11:04 AM

Quote:

Originally Posted by 1660

Came across this on ft86club:

http://www.ft86club.com/forums/showthread.php?t=1259

It will give a lot of insight on Yamaha's approach on design.

Um, that is us...

Mr.Jay · 08-10-2011, 05:45 PM

Quote:

Originally Posted by Dimman

Um, that is us...

yea... we are GOOD

ryun84 · 08-10-2011, 11:05 PM

Quote:

Originally Posted by 1660

Came across this on ft86club:

http://www.ft86club.com/forums/showthread.php?t=1259

It will give a lot of insight on Yamaha's approach on design.

Quote:

Originally Posted by Dimman

Um, that is us...

Quote:

Originally Posted by Mr.Jay

yea... we are GOOD

1660 · 08-11-2011, 02:13 AM

Quote:

Originally Posted by Dimman

Low RPM response has a bit to do with how 'active' the intake charge is in the chamber. If the air is slow, there is not very much turbulence and the air and fuel don't mix and burn as well as they should. This affects torque.

So there is a bit of performance potential with low RPM airflow tuning.

@Madfast: Thanks for that post!

If Yamaha takes the ITB approach like the LF-A, there won't be much left on the table. That would be a costly approach for a Scion and would probably gain more than 200 HP. On the other hand, if Yamaha takes the 2ZZ-GE approach, I think the easiest way to get more power is to increase air and fuel, larger TB and re-mapping the AFR. Yamaha will tune the intake and exhaust, so porting and polishing would help.

The crank would be forged and the connecting rods would be high strength steel, so you could probably raise the RPM limiter or fuel cut off.

Dimman · 08-16-2011, 11:16 PM

Interesting find. ITB's for an STI, from Tomei.

http://www.tomei-p.co.jp/_2003web-ca...efr_index.html

Only $5k...

82mm 4g63 · 08-16-2011, 11:23 PM

Quote:

Originally Posted by Dimman

Only $5k...

Haha only 5grand. Good deal.

ichitaka05 · 08-16-2011, 11:26 PM

Quote:

Originally Posted by Dimman

Interesting find. ITB's for an STI, from Tomei.

http://www.tomei-p.co.jp/_2003web-ca...efr_index.html

Only $5k...

Edit: Never mind found out

1660 · 08-17-2011, 12:50 AM

Quote:

Originally Posted by Dimman

Interesting find. ITB's for an STI, from Tomei.

http://www.tomei-p.co.jp/_2003web-ca...efr_index.html

Only $5k...

I'll say one thing. It does look nice.

Dimman · 08-17-2011, 12:52 AM

Quote:

Originally Posted by 1660

I'll say one thing. It does look nice.

It better do a whole lot more than just look nice for $5k.

1660 · 08-17-2011, 02:22 AM

Quote:

Originally Posted by Dimman

It better do a whole lot more than just look nice for $5k.

It will. Just pop your hood and everyone will go, "Uuuuhhh, aaaahhh!"

Tyandriel · 08-19-2011, 11:02 AM

Quote:

Originally Posted by madfast

lets hope the ecu can be easily tuned

16:1 lean?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
What is your prediction on FT86 power and Subaru 086a power?	86Fan	Scion FR-S / Toyota 86 GT86 General Forum	88	08-27-2013 12:49 AM
Maybe the FT-86 doesnt need massive power........	TriggerTRD	Scion FR-S / Toyota 86 GT86 General Forum	67	07-01-2011 12:58 AM
DI and engine power loss over time	Sport-Tech	Engine, Exhaust, Transmission	7	06-27-2011 06:49 PM
volkswagen power days monza -- test drive golf gti --	lancie	Other Vehicles & General Automotive Discussions	0	06-21-2011 08:06 AM
is your new M3 down on power?	NESW20	Other Vehicles & General Automotive Discussions	6	12-27-2009 11:03 AM

08-10-2011, 04:19 AM	#45
1660 On the Rise Join Date: Oct 2009 Drives: Toyota Location: Anaheim Posts: 289 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Came across this on ft86club: http://www.ft86club.com/forums/showthread.php?t=1259 It will give a lot of insight on Yamaha's approach on design.

User Name		Remember Me?
Password